Instance numbers are changeable.

Instance numbers are changeable.

• A. True
• B. False
• C. Cannot be changed
• D. Not applicable

Answer: (B)

Instance numbers identify a specific data object within a PGN on the NMEA 2000 bus, such as which of several identical sensors is providing data. They serve as part of the object’s identity, so receivers know exactly which source produced the information. Because changing this identifier would alter the meaning of the data and could disrupt how other devices interpret the stream, instance numbers are not normally changeable during regular operation. In practice, you may configure which device presents data on the bus, but you don’t freely reassign the numeric instance of an existing data object. That’s why the statement is not correct.

Instance numbers identify a specific data object within a PGN on the NMEA 2000 bus, such as which of several identical sensors is providing data. They serve as part of the object’s identity, so receivers know exactly which source produced the information. Because changing this identifier would alter the meaning of the data and could disrupt how other devices interpret the stream, instance numbers are not normally changeable during regular operation. In practice, you may configure which device presents data on the bus, but you don’t freely reassign the numeric instance of an existing data object. That’s why the statement is not correct.